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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c060d4c2ec8c92eca72b87f4a3d96c5b0dcc0b2904c394fb99e95a1d81693c' 
  AND token = 'flcxOyIXUYoojMTVOi2j/t4w11oah0hFBwU4Z0e7JUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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