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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d674df5aef288c00ac969e7587ee11b779a5f5730f6cd18f009d5949f16018' 
  AND token = 'FUkn1VtVphDEanfk4bim9fVmODfGO3WXJ0kBw+KaBvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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