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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0431ffa434f0f56f942f1dd41b2e372baadddbd49242b96c396368bddf9c1c31' 
  AND token = 'MxCxWg3qb65XzuMTwPyQWXt5PW/gVBPewabwZ2MJVhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}