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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2dd2a25b68aff08422250b68fc2c5fd16af555261d4fea20e44778c413164f' 
  AND token = 'DEC/56V/fnI+5WOHIiusaY00J/R2pVVv1Zc6Md1yGTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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