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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '384debc6b4159cac78a2609194a40a81313e198a49c5e83495acbcd6ba17ae80' 
  AND token = 'KpTvyKD5HVqys2e3wRUpxGD6Y5uxTl2SE67sGpnI6Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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