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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92cc1922b7f1f83ff8734d98b7cbff0dcac087bd7110907b6fbcb4922ccd4222' 
  AND token = 'nL5UtDy1M2p4ir5CHbWYJdVwtMiW5m9MbI6BxeHTn7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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