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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d00d45ec7c5ea3b20eaca299b326ac0ebb9120ecb4b2863005ec3f5e3c972a' 
  AND token = 'Xcvb4vfSQETq3vokW92zHRui6/5b0USXRa+7ZeB03KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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