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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b657151f9142cc8ec99a2327a44731ff596d9559df7e0b8c2dabc38a71a5e5eb' 
  AND token = '804m/T32YJqoJ0kdP8QkFXIC7N+jmUB56czI56kgfxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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