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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb90483fce35095b4b0c5524e1e8fb320b63484b828384752bca505d1587136' 
  AND token = 'ck9flcxKLfCn38dPyB8vt1Hl5/LP3m0PkTHoFr+OtAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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