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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca5690aca8f47e6e03d414adee8033ff77331883c23e9aebc7a767d514ef6447' 
  AND token = 'L4ifM48t03Zvc0tk2I9hE4VR3C6/DYP4rcPBi2/ZgJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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