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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c20569d69807d0f1aea8611910c4adf77754a8fa7adb72432bfb37582e571d5' 
  AND token = 'o8KbcvjZ8MXj8nszMz5/TpvjKtAsxiP/mO29BELs29c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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