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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53b68f41ad408375b8c8b3d53ee498b048d44fe9e8e1a3d42da96918036efdf9' 
  AND token = 'cXjFN2UAupcRoCGFLOgEgI9ObVpeILxA1yUlUf3243s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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