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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9bccd8c4e2798cd184eb08d66dea483dc8902f4c9bf2e91edd2b44d221cb237' 
  AND token = 'F6RyivlEu0QhSAvorxI9NUX3dMCgPSqY1e3MDzsHqAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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