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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3da2151593eff4667bb83c6436977e274dd5ff553a5d224668b9b4a43b1d1ce' 
  AND token = 'so/C3jA/UaBG397m5rq7ZuPapsf2aZYWCdpmzkcleC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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