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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b677fe5331c07c6ceca4c3e13cc0b26c16b63f0235497fcbbe662b03e0ec35' 
  AND token = 'sU6/vyjf9VM6fiFUMvEIG+t3NpQ13pFKIu8/kjpztqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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