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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f18bc590ec463ac00381e01fc845dbfc640fa1e5b170781091ba8741af5d9d26' 
  AND token = '31xso6LPmpjwmbOW2L4c0gTfIgnAxCjIbB07RWtoLq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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