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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f844673fba7b7bc4cb3dad11598ac7c6ecc40b251627e40bc4d1e25e4c9c3114' 
  AND token = 'FFflp22+FIijPSnoAoygOGAx6+SmqZDOrZT4lgStvPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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