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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ac53935e9cb2e8f69f95ed5197913920e09de106ef2483658b7c70417590f4' 
  AND token = '0WIDy6bWa5DRiRaBgupZoJUY2t+rzyUo2yTfUnCFg/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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