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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fe131d2fed8ba3ab0c5fe386027ca6e9bffe5b5c7c104c700d3d72ae6726bdc' 
  AND token = 'wQNP80xQIOUv9pZ6dvwkXGrZt4n/vcOdJSo2zhIkdv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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