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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61574ee131d0130550c904140774f8c3901e8889d5b4a107154339714f5d999f' 
  AND token = 'fVYn0GIs7nO02/bz7ADqImbYqIydXZ6iG+mFSqBQRMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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