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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64be4af34fbda127217420ac2214f6f5963b16591e1892a9e3c354bd4706db6' 
  AND token = 'DHRKRgKhWm7S0JuRd/ttsUQ3w5/0Mndsh2DkrFtWZ6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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