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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856de9597d6473392e87ca97d8c3ec26b1483e4d29835f803d73c776c52b455d' 
  AND token = '1ORsOjLuJrYzWQK7J8ESrH+SWD6KpcunEH4AG6XIBf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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