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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ac314e8845f23212990a329dae403682d3791ea903f69caea48a321bf0001e' 
  AND token = '/REYoveYJZ4hdtyYXXt7OB1XEXbhuKymQgY8HvMf3fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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