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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8869c50837922018eb35b0fd816d03e026cdb9b4dc5b03daea7f042662f1223' 
  AND token = 'j2Syh+Y6JITFwX9lP8bahWnvqwTE30c4hw7FO7U9FpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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