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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd608ac090325568716d4930c996bb2c6ffae710baa0228ce185c5962b8fbfdb2' 
  AND token = 'Dt9BT4zKeQH/Q2/AKkuzodE/9fEAc3qpLeT0513vo84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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