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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c24b4c3cfe9b30d70c80da74145dd7fc31d7668608c1d17d20597718dfa968d' 
  AND token = 'SbMhyH+WqziavP1WgG8eA/p6wItsd1RnJZhyTo2ZcTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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