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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1b8836fdd5e62d5350eee666841230bc6e6b4cc95e1143bf93e531feb588bd' 
  AND token = '3Depf+oDqB/D9uoKyP9v068zD1KZNLny1B3e56LUMR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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