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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e9b306f7e24f1d52ef9ff0df6f6066f2a043c92623ded520eb89087d5aed87' 
  AND token = 'XAYtdC+gOqwMzQyHWOnBfKKjDSc4pAspIINyGRK53j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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