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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf289d1182333e2622572328f3cbbf1dd559e9248cf04758001a5be2ef1f88b' 
  AND token = '/5PuK3yfMJ5Lib586RxhFakEw+AUIrz4Veo1tzH4drA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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