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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7bb09d9079f22155d9dce943b7dec75388b4eeb24d4adc389cb3750759a5023' 
  AND token = 'u1JW4bAGHbXhVBhlK2EM2gfV9VcJUe5GQ+s7R0nUbGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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