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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73cad6c640bdb761d4d29d3bad7af368168c73f72b9352d8399d4f01a9b4603d' 
  AND token = 't3B2ciciFnh5AV4E+OFTYLYHauRmW1c7xtz4bULZFBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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