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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5e2724ad7c6dbfad7f1a3190fb69d5a4936cf19117bed23ca75b68332cfd8f' 
  AND token = 'uye35eU3Z1LsznWkYCMfYIssD7ko5ukBT/x3JC3mlPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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