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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b5c2369bace0f7d8a82add1a599e263e37bf62079c59004db2d4fc82e2daa5' 
  AND token = 'Cn1is9qSUBlkR2GlUqyRt1TEoAHmS+fPLOiTr5CtmKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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