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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d626af05e83f14dc432d1328b7356809d1daa857d17ed2f2f7f45f9484c27d' 
  AND token = 'TndG/0OEIYHGBsl0RTZxcIOfwhPMNS/eWnk+1sgZTxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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