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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5fd09100b97d590895dc0a75a0b8c5cfc0cec30323b4405dfbf0376b8379777' 
  AND token = '1b+Twm1Jjwbnc5lw6BSkyt0KR6qh/2ioy4r8QOeFQBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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