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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f733e44a6707864854b1dd4582c4569e87bd081d78e611ffe947ccd78a218ac9' 
  AND token = 'mrndzG9xfc8ILs+PQRK2sjH5nW5L10DA8gfIPtzkQRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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