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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71fd55104b315c3fd710cdb39411ec08ba089a7443f4ea63cee6c0a82fd43e6' 
  AND token = 'RFilmMCGKDwSZyz0v6/qglDwH43q58b4QuaoiGCtqeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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