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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb654c52085d9369c3a8b2b21fab38484ba9233725ad7afe10b6efc1e360f34c' 
  AND token = 'szkpqzZt5l/9Vq0d0U0x8uehil2DATyhHr0IPAVDXdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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