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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc1a28789f60e3e6a4f4ad857934ff9f93f03861312fca474b02d92c3513572' 
  AND token = '2c1EQ5k//Obnz7z9p06SaGz+iw22rR9ZxidnVF+DyqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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