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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb5fc956a64faf62d25c393fee3270b15b25224395053677e60028e03a3e237' 
  AND token = 'SjurA48sTg88vZFdqjn21608oM02Pdt6U+ooUd5NuSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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