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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f009267b35374077580923edf941d29106fc8f62c732c5ace8b85e8a65f8030' 
  AND token = 'MU2moTd/cnJhbB39CBwFAib/MwmZtf8tiV8/SfSVPso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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