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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caeb1eef4ac3fd8e44344ebd799288074daa1c1445337aab2c1246ba9e6985a1' 
  AND token = 'wk0fLtuIYJx5sChH1W+CXZ0BYh+OsY4xMteG3wsyGV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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