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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed8f605edba3da8b12cbf472946b3384284d1217c00c2ee401f353122ce32b6e' 
  AND token = 'jKd1jVz7suJ2fYZXFRThAR8zzBvNeNstbGQaFkLdphE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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