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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a83c750b9d79bf781f821cad3dd49bc6e9d8ecef377646c49dafcd9306dd480' 
  AND token = 'iOQSANK25wg0BPpRrWCnI/r49c7BLyOep2Wcp3tWgnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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