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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a01f81edc988cd2ac0eb36299f31a7e0944d7d92b72bbb4b0e5ae0cb02e3a6' 
  AND token = '1li3mrk19ecPpmjpfvg1Oh8Xsc2NqZ7xbQdRnylXjh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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