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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf7d800a7a1ab8e4dca1ad94921480cd0a2f802748cb1658522e318a7bbb5ab' 
  AND token = 'YMWJoX6Ka3KA9iOc+125LcyPgEHK4jszeiKg+Ke9cO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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