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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff1c19e17ed571d6e871c35767983691f40b452caa80a0ce8fccefc1d962d24' 
  AND token = 'FXjYlqU4jC0nTofk+X4AIj/qHi6SK9E6Ow7NzXtTk1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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