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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feba5e9af5731cccd45f04bb0d883e6a5b29cea4bab93ce4d40e0bc252813470' 
  AND token = 'QMRvaE5OZv7MoNEhH82bxIgv/4IZmDdv86ZbmvoH8MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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