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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809809623e0c44ceba849c61ea74136d40f2550a5a1ed62425c091dd490fb324' 
  AND token = 'Fhg6RowddH7SZg+omrDMRhecuHDNPg4L5mXIG360x3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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