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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c6b7d8c498ede09d15df30477dce352c175ce4cd047c8933f5b87a6e3b1f79' 
  AND token = 'rwbO8jMRQDdeP9C/Kq9j2QegNWzDLEiGcJf3p5k4uSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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