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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb3d32e1541f45aacf13cfeb0c919e870138ac69be6ab60a90b5ded9dd9557d' 
  AND token = '6TKpXl28jGb5ZkEYLrl/d1XQtf0yK0RrWqXtPdW+5IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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