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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '565f0eb21c557dafc39df72977251b40160fd7d3e3bb95078aa4c92eb357dcb2' 
  AND token = '7JGYSAfYWC8aq8GUScJgWeOLUUyIR3Aea02DdVU7mrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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