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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa2eefab9611226e49e35aef83c03a2feaa130d69df4381358d21ca6493c474' 
  AND token = '6ein5SxWZTvRTVuWJVErQ91wh9JUSuK4cg2wL7TtrfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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