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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696bd6d879ed38fb1deb0e634477c71896e088957d31f08c9f63f5847cdb743d' 
  AND token = 'MP9JxVhjNz79+Xhjcnu0HcrMSP1c7Pn2cwExCldLqmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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