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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfdf57ed85b0f915262994731ec6d9cdae60ee69c8e12ec0c2e6321df5cac48c' 
  AND token = 'hvVQFtiS3Cmf1Pp1g1enyK4vnA/pDg3h+WM7bddcr5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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