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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47954a6587cf24547e0883b8df67f8bdbae1811a3c028cc246db1956a528e81' 
  AND token = 'v/AvfA0kxGBjYeL2Dto4HBJbaCxebp2e/bsmv5+ka9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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