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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb8cce038aee657d39c5266f8c161d4a73e207d5a6448edaaa6720d18ba7522' 
  AND token = 'p+QQ7QgJJ/eviX1Up6i42tTACQ/5xBlMSZpFgXZ6Sc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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