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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836b0c8c8894af101909cba05470be6fb7ef4fdd9738c1f91f733ee480b9df33' 
  AND token = 'sArmjsacY9UqCOBixlJDFMMBgizoFU81Z+BcEnE7m38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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