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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002a5cc035a593198baedebe12aa0c8e0b10f6423e3452acb42bbc4c35b7c523' 
  AND token = 'ssAG48O8blyKSeDMSUN1SVLIX6ft4psgdj5MIyCihUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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