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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '800dc170c3835ea817da586920e3d1ce83ffc3d49aa547162e70ec457ddff6b4' 
  AND token = '2cpgUH+edmAqijtq0GELxCUEhO9eLiwhHShtbgwyew0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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