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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca20fb03b4100cbbf19f39797f7d041fcba3075d41d244426d806533d61540ed' 
  AND token = 'PJtQY0lJ/Q6YxiINjGomOIjdEUYQL5kB4S/DjdXAY08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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