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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f43113ed821e3fb6c3f5c26d4f92c9f0eb11e5880c5917c6aacce0bdc4ad0f8' 
  AND token = 'bs58RhIIk9LP85lo1efkczSiWk0py27Hwz5AaiUxRKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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