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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ef97464cf885f9ecd967d66bc1a1400b202c40aa0cb562e59c4be85f60a462b' 
  AND token = '2X/CqnVurC8CiBds0W+Hoq1pc01XF0YDMPSZPyhgs2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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